Lower-Right Pixels of Rectangle Not Included in FRAMERECT (43697)


The information in this article applies to:

  • Microsoft QuickBASIC Compiler for the Apple Macintosh 1.0
This article was previously published under Q43697

SUMMARY

The video mapping of the Macintosh, as used by Toolbox calls such as FRAMERECT(), is based upon infinitely small points instead of finite pixels. Because of this mapping scheme, when a rectangle is defined for a Toolbox call, the lower-right pixel boundary is one less than the point boundary. These calls are described on Pages 401 to 404 of the "Microsoft QuickBASIC for Apple Macintosh: Language Reference" manual.

MORE INFORMATION

For further information on Macintosh video mapping, refer to the QuickDraw section of "Inside Macintosh Volume I."

Code Example 
REM For example, the corners of the following rectangle are actually
REM   (100,100) and (199,199):

rect%(0)=100           ' Y1
rect%(1)=100           ' X1
rect%(2)=200           ' Y2
rect%(3)=200           ' X2
CALL FRAMERECT(VARPTR(rect%(0)))

This information applies to the following Toolbox routines:

   FRAMERECT, PAINTRECT, ERASERECT, INVERTRECT, FILLRECT

   FRAMEROUNDRECT, PAINTROUNDRECT, ERASEROUNDRECT, INVERTROUNDRECT,
   FILLROUNDRECT

   FRAMEOVAL, PAINTOVAL, ERASEOVAL, INVERTOVAL, FILLOVAL

   FRAMEARC, PAINTARC, ERASEARC, INVERTARC, FILLARC
Modification Type:MinorLast Reviewed:1/9/2003
Keywords:KB43697
©2002 Microsoft Corporation. All rights reserved.